Ransomware

This category is for ransomware. Generally, ransomware encrypts all data on a user's computer and the attacker demands the victim to pay money (possibly bitcoin for more recent ransomware so the cybercriminal can not get traced back, but it can be any sort of currency) to get their data decrypted (usually by a decryption code or key). Sometimes the attacker gives the code back after they are paid, and other times not.